RT Journal Article SR Electronic T1 Managing Unknown Risks JF The Journal of Portfolio Management FD Institutional Investor Journals SP 85 OP 91 DO 10.3905/jpm.1998.409649 VO 24 IS 4 A1 Graciela Chichilnisky A1 Geoffrey Heal YR 1998 UL https://pm-research.com/content/24/4/85.abstract AB